Bump yeoman-generator from 4.0.2 to 4.2.0

Bumps [yeoman-generator](https://github.com/yeoman/generator) from 4.0.2 to 4.2.0.
- [Release notes](https://github.com/yeoman/generator/releases)
- [Commits](yeoman/generator@v4.0.2...v4.2.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -31,7 +31,7 @@
   "dependencies": {
     "chalk": "^2.1.0",
     "underscore.string": "^3.3.4",
-    "yeoman-generator": "4.0.2",
+    "yeoman-generator": "4.2.0",
     "yosay": "^2.0.1"
   },
   "jest": {